Railway Engineering
Consider the following surveys.1. Reconnaissance survey2. Preliminary survey3. Traffic survey4. Location surveyThe correct sequence in which these surveys are conducted before the alignment of a track is finalised is

3,1,2,4
3,1,4,2
1,3,2,4
1,3,4,2

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Railway Engineering
A triangle is used for

Changing the direction of engine
Separating all the sidings and shunting lines from main lines
Preventing the vehicles from running off the track
Transferring wagons to and from parallel tracks without shunting

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